package custom.security.core.validate.code;

import custom.security.core.validate.code.image.ImageValidateCode;
import lombok.extern.slf4j.Slf4j;
import org.springframework.social.connect.web.HttpSessionSessionStrategy;
import org.springframework.social.connect.web.SessionStrategy;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.context.request.ServletWebRequest;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

/**
 * 校验验证码controller
 * Created by wgt on 2017/10/14.
 */
@Slf4j
@RestController
public class ValidateCodeController {

    private static final String SESSION_VALIDATE_CODE_KEY = "VALIDATE_CODE_KEY";

    private SessionStrategy sessionStrategy = new HttpSessionSessionStrategy();

    @GetMapping("/image/code")
    public void getImageValidateCode(HttpServletRequest request, HttpServletResponse response) throws IOException {
        ImageValidateCode imageValidateCode = createCode(request);
        sessionStrategy.setAttribute(new ServletWebRequest(request),SESSION_VALIDATE_CODE_KEY,imageValidateCode);
        ImageIO.write(imageValidateCode.getImage(),"JPEG",response.getOutputStream());
    }


    /**
     * 生成图片验证码
     * @param request
     * @return
     */
    private ImageValidateCode createCode(HttpServletRequest request) {
        int width = 67;
        int height = 23;

        BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
        Graphics g= image.getGraphics();

        Random random = new Random();

        g.setColor(getRandColor(200,250));
        g.fillRect(0,0,width,height);
        g.setFont(new Font("Times new Random",Font.ITALIC,20));
        g.setColor(getRandColor(160,200));
        for (int i=0;i<155;i++){
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            g.drawLine(x,y,x+xl,y+yl);
        }

        String sRand = "";
        for (int i =0;i<4;i++){
            String rand = String.valueOf(random.nextInt(10));
            sRand += rand;
            g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
            g.drawString(rand, 13 * i + 6, 16);
        }

        g.dispose();

        return new ImageValidateCode(sRand,60,image);
    }


    /**
     * 生成随机背景条纹
     *
     * @param fc
     * @param bc
     * @return
     */
    private Color getRandColor(int fc, int bc) {
        Random random = new Random();
        if (fc > 255) {
            fc = 255;
        }
        if (bc > 255) {
            bc = 255;
        }
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }
}
